
 #!/bin/bash
 function s1_goto_dir(){
 cd "$1"
 }
 function s2_touch_empty_file_wich_given_name(){
 touch "$1"
 }
 function s3_make_directories(){
 mkdir -p projects/{git,backup}
 }
 function s4_create_6_files(){
 touch projects/linux{1,2}_{centos,redhat,c_programming}
 }
 function s5_make_directories_in_git(){
 mkdir -p projects/git/{linux1,linux2}
 }
 function s6_move_files_to_dir_1_or_2(){
 mv projects/linux1_* projects/git/linux1 && mv projects/linux2_* projects/git/linux2
 }
 function s7_create_package_and_compress(){
 tar -czvf projects/backup/git.tar.gz projects/git
 }
 function s8_delete_dir_git(){
 rm -rf projects/git
 }
 function s9_recover_from_git_tar_gz_backup(){
 tar -zxvf projects/backup/git.tar.gz -C ./
 }
 function s10_create_package_and_compress(){
 tar -jcvf projects/backup/git.tar.bz2 projects/git
 }
 function s11_find_and_sort_alphabetically_all_created_files_and_dirs(){
 find ./projects |sort
 }
 function s12_get_next_15_minutes_boundary(){
 date +'%Y-%m-%d_%H:%M:%S' -d @$(( $(date +%s)/900*900+900))
 }

